which wrasse is the most useful ?

yellow corris and green wrasse personally I think the green wrasse is a tougher fish
I was talking with a lfs the other day and they said they dont ship well they only have about a 50% survival rate
 
Halichoeres melanurus, Halichoeres lecoxanthus - Canary top or White belly wrasse (often confused with the yellow coris/canary wrasse - Halichoeres chrysus) and the best for montipora eating nudibranchs the Halichoeres iridis - Radiant wrasse.
 
Honestly I think any of the smaller halichoeres wrasses are great for pest control, and general overall great reef fish.
 
Like SDGuy said. I also have a Velvet wrasse (Cirrhilabrus rubrisquamis) that loves to eat bristle worms. He knows that when I use my Mag Float there will always be a worm or two that are hidding under the float and he waits for them.
 
Why do you want to get rid of your bristles worms? Personally I avoid wrasses that feed on the substrate because they eat so many beneficial creatures.
 
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